Bond Street Station Upgrade/Crossrail

73 miles of tunnel stretching from Reading in the west to Shenfield in the east passes beneath the centre of London along Oxford Street. At Bond Street it interfaces with London Underground’s station and a cross passage passes below the Mid-level sewer.

Geotechnical Observations installed 100m of SAA along the crown of the sewer to measure settlement and three circular SAAs (pictured) around the intrados of the sewer to check convergence where the cross passage is located. SAA is ATEX certified making it safe for use in potentially explosive environments.